Healing in this game is a lot of fun, but personally, as pointed out earlier, a fair few healers don't like pugs. Addons I can live without, played healers in way too many games to rely on them
The problems that are there, are not so much the healing, but game customisation/ui...
Health bars don't always update instantly, sometimes you click a party member and it doesn't register, you must click their picture rather than their health bar, frames can't be moved, your own health bar isn't included in the party frame (this annoys me a lot, but tbh I've not properly checked the options to see if it's there ).
Operation bars help some of this, although you can't see party members companion health and seems to update slow sometimes which isn't ideal.